Jachymski showed that the set $$ \bigg \{(x,y)\in {\bf c}_0\times {\bf c}_0\colon \bigg (\sum _{i=1}^n \alpha (i)x(i)y(i)\bigg )_{n=1}^\infty \text {is bounded}\bigg \} $$ is either a meager subset of ${\bf c}_0\times {\bf c}_0$ or is equal to ${\bf c}_0\times {\bf c}_0$. In the paper we generalize this result by considering more general spaces than ${\bf c}_0$, namely ${\bf C}_0(X)$, the space of all continuous functions which vanish at infinity, and ${\bf C}_b(X)$, the space of all continuous bounded functions. Moreover, we replace the meagerness by $\sigma $-porosity.
Ten Southern Hemisphere cephalopod species from six families collected from six localities in western, southern and eastern Australia were examined for dicyemid parasites. A total of 11 dicyemid species were recorded, with three cephalopod species uninfected, four infected by one dicyemid species and three infected by multiple dicyemid species. Dicyemid species prevalence ranged from 24-100%, with observed infection patterns explored due to host size, host life history properties, host geographical collection locality and inter-parasite species competition for attachment sites, space and nutrients. Left and right renal appendages were treated as separate entities and four different patterns of infection by asexual and sexual dicyemid stages were observed. The detection within a single host individual of asexual dicyemid stages in one renal appendage and sexual dicyemid stages in the other renal appendage supported the notion that developmental cues mediating stage transition are parasite-controlled, and also occurs independently and in isolation within each renal appendage. Our study exploring dicyemid parasite fauna composition in relation to cephalopod host biology and ecology therefore represents a thorough, broad-scale taxonomic analysis that allows for a greater understanding of dicyemid infection patterns.
There is an intuition that the past does not ever change. In their paper ''The puzzle of the changing past'', Luca Barlassina and Fabio Del Prete argue that in 2012 the past changed. I show that we are not in a position to accept their argument., Existuje intuice, že minulost se nikdy nezmění. Luca Barlassina a Fabio Del Prete ve svém příspěvku ,,Hádanka měnící se minulosti'' tvrdí, že v roce 2012 se minulost změnila. Ukazuji, že nemůžeme přijmout jejich argument., and Terence Rajivan Edward
This paper sums up the results of light microscopical, ultrastructural and molecular studies of five strains of amoeboid organisms isolated as endocommensals from coelomic fluid of sea urchins, Sphaerechinus granularis (Lamarck), collected in the Adriatic Sea. The organisms are reported as Didymium-like myxogastrids. Of the life-cycle stages, the attached amoeboids, flagellated trophozoites, cysts and biflagellated swarmers are described. Formation of fruiting bodies was not observed. Although phylogenetic analyses of SSU rDNA sequences indicated a close relationship with Hyperamoeba dachnaya, our sea-urchin strains have not been assigned to the genus Hyperamoeba Alexeieff, 1923. The presence of either one or two flagella reported in phylogenetically closely related organisms and mutually distant phylogenetic positions of strains declared as representatives of the genus Hyperamoeba justify our approach. Data obtained in this study may be useful in future analyses of relationships of the genera Didymium, Hyperamoeba, Physarum and Pseudodidymium as well as in higher-order phylogeny of Myxogastrea.
Metodu "kinetic impactor" (test změny trajektorie asteroidu na kolizní dráze Země) představuje Dr. Petr Pravec, pod jehož vedením česká spolupráce na tomto projektu probíhá. and Jana Žďárská, Petr Pravec.
Historiography has shown that the implementation of land reforms in East Central Europe has been greatly stimulated by the particular post-war situation and was influenced by the balance of power in the respective countries. The differences in the radicalism of land reforms depended largely on whether the redistribution of land and property rights could be used to strengthen the new state nations and/or to weaken the former privileged ethnic groups, like Germans, Hungarians or Russians. Nevertheless, the question arises to what extent certain similarities and differences of land reforms were caused by the reception and adaptation of concepts from other countries and from the pre-war times. Germany is often
overlooked in this context because here, after 1918, no major land reforms (but settlement projects) took place. The paper contains examinations of debates on “optimal” land ownership distribution as they were part of German agricultural politics and agricultural sciences (Max Sering) and of the attempts to implement these ideas before the First World War. The article emphasizes the mutual relationship of nationalistically motivated settlement policies and the economically and socio-politically motivated inner colonization. While national goals were not achieved, the interaction of the Poznań Settlement Commission, of the General Commission and of the private Polish and German parcelling agencies caused a signifi cant change in farm size structure by strengthening the rural middle classes. In a second step, a comparison between the German/Prussian settlement policy and “inner colonization” on one side and the East Central European land reforms on the other shows many similarities. The article ends with a plea for a transnational perspective on land reform history by the reconstruction of concrete transfer processes. and Článek zahrnuje poznámkový aparát pod čarou